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It's not "theory". The optics of the eye are very well known. In addition to the above book read: What fish see: Understanding optics and color shifts for designing lures and flies. by Colin J Kageyama O.D., F.C.O.V.D. This book is a little more technical than Sosins and concentrates more on steelhead than bass, and doesn't explore a lot of night vision, mostly daylight in which they did experiments on bass and they could see different colors, and even fishing line down to 4# test. I also came across a magazine article some time ago the said the same thing written by another Doctor of optometry and I recall he said daytime then can see colors well but nighttime is a different shades of gray world. The fact that fish can't speak has nothing to do with it.
That said, light (colors) and dark (colors) are perceived differently, they just can't differentiate between yellow and say green at night.
Now that I picked it up I am going to re-read this, I forgot how cool this is.
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